I just got a crocea too, they like to be on rocks, I had mine on the sand bed so I put a flat rock under and now I'm waiting for it to attach. I will move it up once its attached.
croceas prefer rockwork, will burrow into it until there's nothing but mantle showing in the wild- letting them attach on rock and then gradually moving them up into rock (and brighter light) is a good idea- good luck
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